summaryrefslogtreecommitdiff
path: root/arch/powerpc/kvm/book3s_hv_interrupts.S
blob: 928142c64cb00ed2ce0d30081222b66abc45ddc0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
 *
 * Derived from book3s_interrupts.S, which is:
 * Copyright SUSE Linux Products GmbH 2009
 *
 * Authors: Alexander Graf <agraf@suse.de>
 */

#include <asm/ppc_asm.h>
#include <asm/kvm_asm.h>
#include <asm/reg.h>
#include <asm/page.h>
#include <asm/asm-offsets.h>
#include <asm/exception-64s.h>
#include <asm/ppc-opcode.h>

/*****************************************************************************
 *                                                                           *
 *     Guest entry / exit code that is in kernel module memory (vmalloc)     *
 *                                                                           *
 ****************************************************************************/

/* Registers:
 *  r4: vcpu pointer
 */
_GLOBAL(__kvmppc_vcore_entry)

	/* Write correct stack frame */
	mflr	r0
	std	r0,PPC_LR_STKOFF(r1)

	/* Save host state to the stack */
	stdu	r1, -SWITCH_FRAME_SIZE(r1)

	/* Save non-volatile registers (r14 - r31) and CR */
	SAVE_NVGPRS(r1)
	mfcr	r3
	std	r3, _CCR(r1)

	/* Save host DSCR */
BEGIN_FTR_SECTION
	mfspr	r3, SPRN_DSCR
	std	r3, HSTATE_DSCR(r13)
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)

	/* Save host DABR */
	mfspr	r3, SPRN_DABR
	std	r3, HSTATE_DABR(r13)

	/* Hard-disable interrupts */
	mfmsr   r10
	std	r10, HSTATE_HOST_MSR(r13)
	rldicl  r10,r10,48,1
	rotldi  r10,r10,16
	mtmsrd  r10,1

	/* Save host PMU registers */
	/* R4 is live here (vcpu pointer) but not r3 or r5 */
	li	r3, 1
	sldi	r3, r3, 31		/* MMCR0_FC (freeze counters) bit */
	mfspr	r7, SPRN_MMCR0		/* save MMCR0 */
	mtspr	SPRN_MMCR0, r3		/* freeze all counters, disable interrupts */
	mfspr	r6, SPRN_MMCRA
BEGIN_FTR_SECTION
	/* On P7, clear MMCRA in order to disable SDAR updates */
	li	r5, 0
	mtspr	SPRN_MMCRA, r5
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
	isync
	ld	r3, PACALPPACAPTR(r13)	/* is the host using the PMU? */
	lbz	r5, LPPACA_PMCINUSE(r3)
	cmpwi	r5, 0
	beq	31f			/* skip if not */
	mfspr	r5, SPRN_MMCR1
	std	r7, HSTATE_MMCR(r13)
	std	r5, HSTATE_MMCR + 8(r13)
	std	r6, HSTATE_MMCR + 16(r13)
	mfspr	r3, SPRN_PMC1
	mfspr	r5, SPRN_PMC2
	mfspr	r6, SPRN_PMC3
	mfspr	r7, SPRN_PMC4
	mfspr	r8, SPRN_PMC5
	mfspr	r9, SPRN_PMC6
BEGIN_FTR_SECTION
	mfspr	r10, SPRN_PMC7
	mfspr	r11, SPRN_PMC8
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
	stw	r3, HSTATE_PMC(r13)
	stw	r5, HSTATE_PMC + 4(r13)
	stw	r6, HSTATE_PMC + 8(r13)
	stw	r7, HSTATE_PMC + 12(r13)
	stw	r8, HSTATE_PMC + 16(r13)
	stw	r9, HSTATE_PMC + 20(r13)
BEGIN_FTR_SECTION
	stw	r10, HSTATE_PMC + 24(r13)
	stw	r11, HSTATE_PMC + 28(r13)
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
31:

	/*
	 * Put whatever is in the decrementer into the
	 * hypervisor decrementer.
	 */
	mfspr	r8,SPRN_DEC
	mftb	r7
	mtspr	SPRN_HDEC,r8
	extsw	r8,r8
	add	r8,r8,r7
	std	r8,HSTATE_DECEXP(r13)

#ifdef CONFIG_SMP
	/*
	 * On PPC970, if the guest vcpu has an external interrupt pending,
	 * send ourselves an IPI so as to interrupt the guest once it
	 * enables interrupts.  (It must have interrupts disabled,
	 * otherwise we would already have delivered the interrupt.)
	 *
	 * XXX If this is a UP build, smp_send_reschedule is not available,
	 * so the interrupt will be delayed until the next time the vcpu
	 * enters the guest with interrupts enabled.
	 */
BEGIN_FTR_SECTION
	ld	r0, VCPU_PENDING_EXC(r4)
	li	r7, (1 << BOOK3S_IRQPRIO_EXTERNAL)
	oris	r7, r7, (1 << BOOK3S_IRQPRIO_EXTERNAL_LEVEL)@h
	and.	r0, r0, r7
	beq	32f
	mr	r31, r4
	lhz	r3, PACAPACAINDEX(r13)
	bl	smp_send_reschedule
	nop
	mr	r4, r31
32:
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
#endif /* CONFIG_SMP */

	/* Jump to partition switch code */
	bl	.kvmppc_hv_entry_trampoline
	nop

/*
 * We return here in virtual mode after the guest exits
 * with something that we can't handle in real mode.
 * Interrupts are enabled again at this point.
 */

	/*
	 * Register usage at this point:
	 *
	 * R1       = host R1
	 * R2       = host R2
	 * R12      = exit handler id
	 * R13      = PACA
	 */

	/* Restore non-volatile host registers (r14 - r31) and CR */
	REST_NVGPRS(r1)
	ld	r4, _CCR(r1)
	mtcr	r4

	addi    r1, r1, SWITCH_FRAME_SIZE
	ld	r0, PPC_LR_STKOFF(r1)
	mtlr	r0
	blr